*{padding: 0;margin: 0;}
.top{height: 50px;background: #4A708B;text-align: center;font-size: 20px;}
.top_menu{width: 600px;height: 40px;margin: 0 auto;padding-top: 12px;}
.top li{display: block;float: left;    padding-right: 23px;padding-left: 17px;height: 50px;margin-top: -12px;line-height: 50px}
.top a{color: white;text-decoration: none;}
.main{width: 600px;background: blue;margin: 0 auto;}
.main img{width: 200px;height: 200px;float: left;cursor:pointer;}
.main div {display: none;}
.layer{ position:fixed; background:rgba(0,0,0,0.4); bottom:0; top:0;left:10%;right:10%;display: none; }
.show{ position:fixed; top:33px; left:37%; margin-top:75px; display:none;}
.big{width: 400px;height: 400px;}
.left{position:absolute; top:169px;left:-302px;width: 100px;height: 100px;cursor:pointer;}
.right{position:absolute; top:169px;right:-248px;width: 100px;height: 100px;cursor:pointer;}
.del{width: 100px;height: 100px;float: right;cursor:pointer;}
.temp_li{
    background-color:#a0d0eb;
}